设置单元格高度给我错误 [英] Setting cells height gives me error

问题描述

我在 UITableViewCell 中有一个 UIView 。我正在尝试通过动画更改视图的高度。这是我所做的：

I have a UIView in a UITableViewCell. I'm trying to change the height of the view with an animation. Here is what I did:

self.myViewConstraint.constant = 100; // Coming from 0
[UIView animateWithDuration:0.3f animations:^{
        [self.view layoutIfNeeded];        
    }];

唯一的是，它位于 tableView 。所以这就是我为 heightForRow ... 做的事情：

The only thing is, it's in a tableView. So here's what I did for the heightForRow...:

return self.myViewConstraint.constant == 0 ? 74 : 174;

现在我需要更新 tableView ，所以我插入了 animateWithDuration ：

Now I need to update the tableView, so I inserted in animateWithDuration:

[self.tableView beginUpdates];
[self.tableView endUpdates];

因为我在单元格内有其他东西，因此约束变得混乱，而单元格的高度却处于动画状态。如何在不弄乱约束的情况下更新单元格的高度？ （我想要个单元格的高度进行动画处理。）

Because I have other things inside the the cell, so the constraints get messed up while the cells height is animating. How can I update the cells height without getting the constraints messed up? (I want the cells height to animate.)

这是我得到的警告。 （一切正常，但我只想删除警告。）

Here is the warning I get. (Everything works fine, but I just want to remove the warning.)

编辑，我做了一些更改，现在出现此错误：

Edit I changed it a bit, and I now get this error:

Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSLayoutConstraint:0x7f8d62d15670 V:[tagResultTableView:0x7f8d62d901a0(107)]>",
    "<NSLayoutConstraint:0x7f8d62cea010 tagResultTableView:0x7f8d62d901a0.top == UITableViewCellContentView:0x7f8d62d8fd50.topMargin - 8>",
    "<NSLayoutConstraint:0x7f8d62cf0760 V:[tagResultTableView:0x7f8d62d901a0]-(8)-[UILabel:0x7f8d62d2e2e0'Limit: Up to 5 tags']>",
    "<NSLayoutConstraint:0x7f8d62cf0800 UILabel:0x7f8d62d2e2e0'Limit: Up to 5 tags'.bottom == UITableViewCellContentView:0x7f8d62d8fd50.bottomMargin>",
    "<NSLayoutConstraint:0x7f8d62f726d0 'UIView-Encapsulated-Layout-Height' V:[UITableViewCellContentView:0x7f8d62d8fd50(32)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f8d62d15670 V:[tagResultTableView:0x7f8d62d901a0(107)]>

推荐答案

这里是一个示例。

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return self.myViewConstraint.constant == 0 ? 74 : 174;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ReuseID];
    if (!cell) {
        cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ReuseID];
    }
    if (self.myViewConstraint.constant != 0) {
        [cell doAnimation];
    }

    return cell;
}

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